Metal rectifier assembly



Dec. 14, 1943. E. A. RICII-IARDS HAL 2,336,889

METAL RECTIFIER ASSEMBLY "Filed Aug. 8. 1941 Fig.1. Fig. 2.

4 l/VVEN TOR 6 9 4 8 9 6 4 mm ra 62am ,4 770R NEY' Patented Dec. 14, 1943 METAL RECTIFIER ASSEMBLY Edward Arthur Richards and Leslie James 151- lison, London, England, assignors to International Standard Electric Corporation, New

York, N. Y.

Application August a, 1941, Serial No. 405,957

In Great Britain August 31, 1940 'V 2 Claims. (Cl. 175-366) This invention relates to metal rectifier assemblies and to the effective cooling of the metal rectifier units incorporated in such sets; Metal rectifier units have previously been provided, with aluminium cooling fins but aluminium fins are normally expensive and are at present unobtainable, and it is the object of the invention to provide other cooling means tor use instead of such cooling fins.

According to the invention each rectifier unit of a metal rectifier assembly is provided with a separate cooling chimney.

A cooling chimney an'd rectifier unit according to the invention are shown in the accompanying drawing comprising Figs. 1 to 3, in which Figs. 1, 2 and 3 are respectively a front elevation, a side elevation and a plan.

In the drawing, l indicates a metal rectifier unit secured in position at the bottom end of a cooling chimney. The chimney fits closely over the rectifier unit i and assists the cooling oi the unit by increasing the air fiow over the surface of the unit. The chimney comprises two metal end plates 3 of channel construction serving as supports for two metal side plates 4 of a width suited to the overalllength of the rectifier unit I. The end plates 3 are mountedon the spindle U which supports the discs of the rectifier unit I.

The side plates 4 are fixed to the end memhere 8 by means of screws 6 which may be selfcutting and pass through slotted holes i in order to make allowance for slight variations in the overall length of individual rectifier units. Pieces of insulating material 8 may be riveted by rivets 8 to the insides of the side plates 4 so as to avoid any possibility of the'metal side plates 4 short circuiting discs in the rectifier. These strips and rivets are shown in-Figs. 1 and 2.

In cases where more than-:one metal rectifier unit is employed, each unit is secured in position.

at the bottom end of a separate chimney similar to the chimney shown.

What is claimed is;.

1. A metal rectifier assembly comprising a rectifier stack of a plurality'oi rectifier'elements mounted on a common spindle, channel shaped end plates wider than said rectifier elements mounted with their'l'ower ends at opposite ends of said rectifier stack. and side plates fastened to and held in position by said end plates to form a cooling chimney extending upwardly from said stack. v

2. A metal rectifier assembly according to claim 1, wherein said end plates are mounted on and held in position by said spindle.

ARTHUR memos. menu ums mason. 

